The maximum speed that electrons torn out of a metal can acquire when irradiated with monochromatic light with a wavelength λ is v. The work function for a given metal is equal to Aout. Determine the value of the quantity indicated by *. How many times will the speed of photoelectrons increase when the wavelength of radiation decreases by β times?

λ = 0.65 μm
v = * km/s
Aout = 1.31 eV
β = 4